A Simple Method for the Preparation of Di-, Tri- and Tetrasubstituted Non-Symmetrical Ureas
作者:Nicholas C. Tomkinson、Eve Bridgeman
DOI:10.1055/s-2005-923584
日期:——
The synthesis of a series of di-, tri- and tetrasubstituted non-symmetrical ureas is described. Di- and trisubstituted ureas are prepared in excellent yield by treatment of a phenyl carbamate in a self-tunable single-mode microwave synthesizer with a primary or secondary amine. The synthetically more challenging tetrasubstituted urea can be prepared using the 4-nitrophenyl carbamate and a secondary amine.
申请人:The Board of Regents of the Nevada System of Higher Education on Behalf of the Unive. of Nevada
公开号:US20180118770A1
公开(公告)日:2018-05-03
Provided herein are N-heterocyclic phosphines (NHPs) useful in metal-free phosphorus-carbon bond forming reactions. Methods for preparing vinylphosphonates using NHPs also are provided. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
Synthesis of n-sulfamoyloxazolidinones and -perhydrooxazinones reactivity and use as donors in the transsulfamoylation reaction; application to the preparation of 2-chloroethylnitrososulfamides. IV
compounds in good yields. These sulfamoyloxazolidinones and sulfamoylperhydrooxazinones were revealed as efficient 2-chloroethylsulfamoyl donors in the 2-chloroethylnitrososulfamidessynthesis; five new CENS (derivated from heterocyclic amines and amino acids) were thus synthezised. According to the experimental conditions, N-sulfamoylcyclocarbamates can be reopened by nucleophiles giving addition
Synthesis of 1,3-Disubstituted Symmetrical/Unsymmetrical Ureas via Cs<sub>2</sub>CO<sub>3</sub>-Catalyzed Transamination of Ethylene Carbonate and Primary Amines
作者:Sachin R. Jagtap、Yogesh P. Patil、Anil G. Panda、Bhalchandra M. Bhanage
DOI:10.1080/00397910802638503
日期:2009.5.22
Abstract Cs2CO3-catalyzed transamination of primary amines and ethylene carbonate proceeds to form 1,3-disubstituted symmetrical/unsymmetrical ureas in excellent yields. The effect of different reaction parameters such as influences of bases, temperature, and reaction time were investigated for the title reaction.
Rhodanine Derivatives, a Process for the Preparation Thereof and Pharmaceutical Composition Containing the Same
申请人:Ryu Seong Eon
公开号:US20090042872A1
公开(公告)日:2009-02-12
Disclosed herein are rhodanine derivatives, a method for the preparation thereof, and a pharmaceutical composition containing the same. The rhodanine derivatives have inhibitory activity against protein phosphatases (PPase) such as PTP1B, Prl-3, LAR, CD45, Cdc25A, Cdc25B, Cdc25C, Yop, PP1 and VHR, and can be applied for the prevention and treatment of PPase-caused diseases, including autoimmune diseases, diabetes, impaired glucose intolerance, insulin resistance, obesity, cancers, etc. when the inhibitory activity thereof is modulated.